GW190412
GW 190412was agravitational wave(GW) signal observed by theLIGOandVirgodetectors on 12 April 2019.[1][2]In April 2020, it was announced as the first time a collision of a pair of very differently sizedblack holeshas been detected.[3]As a result of this asymmetry, the signal included two measurableharmonicswith frequencies approximately a factor 1.5 (aperfect fifth) apart.[2][4]
The collision took place 2.4 billionlight-yearsaway.[3]The heavier of the black holes had a mass of 29.7 solar masses, and the lighter one around 8.4 solar masses.[3]The difference in mass meant that the secondaryharmonicin the signal was strong enough to be detected, allowing researchers to perform a test ofgeneral relativityand determine that the larger black hole was spinning.[3]
See also
[edit]References
[edit]- ^"Superevent info - S190412m".LIGO.Retrieved12 April2019.
- ^abThe LIGO Scientific Collaboration; the Virgo Collaboration; Abbott, R.; Abbott, T. D.; Abraham, S.; Acernese, F.; Ackley, K.; Adams, C.; Adhikari, R. X.; Adya, V. B.; Affeldt, C.; Agathos, M.; Agatsuma, K.; Aggarwal, N.; Aguiar, O. D.; Aich, A.; Aiello, L.; Ain, A.; Ajith, P.; Akcay, S.; Allen, G.; Allocca, A.; Altin, P. A.; Amato, A.; Anand, S.; Ananyeva, A.; Anderson, S. B.; Anderson, W. G.; Angelova, S. V.; et al. (17 April 2020). "GW190412: Observation of a Binary-Black-Hole Coalescence with Asymmetric Masses".Physical Review D.102(4): 043015.arXiv:2004.08342.Bibcode:2020PhRvD.102d3015A.doi:10.1103/PhysRevD.102.043015.S2CID215814461.
- ^abcdStarr, Michelle."Astronomers Find First-Ever Collision of Black Holes With a Strange Mass Discrepancy".ScienceAlert.
- ^Berry, Christopher (18 April 2020)."GW190412—A new flavour of binary black hole".Christopher Berry.
External links
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